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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8a6163ee572565d5b3a5fa7391ec88b8b0cde4db74157deba6dd06c18d7880' 
  AND token = 'HMjayBrv3XMZo7mY3Jbk/fHFJVf6God5fRP2a4Q7l0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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