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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3b2eba06b630239e9e16de8f8f1fe51de4f07f63790406d2c23ac3739b952f' 
  AND token = 'dzKoGTU3WpvKwj6eyd3FjSt27WiwMlvIW/y8CEltlZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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