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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8415d25919d6e0890201f1999d63f363a31c5a98c3450fb2066ed92226ee0964' 
  AND token = 's53NSiSKxXdSvvJwUzJiWMYTKKnaNyRlIw1jigWIE8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}