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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001fcb17815226f98a2cb8ad9ecc0c53e554db14ab8cbb358e52a58d9611ae43' 
  AND token = 'yDf1m+5cL8HXtiBGXX31Pp6EdUEnM+HDa2g8LasTH1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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