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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6aaf7dfdb72721ee5efe379e3de89cca90369064cd31c362b3a92829da11ae' 
  AND token = 'cMccJUOKInrOCh/v37/UHx9NS8u8Y6D6aCnTJPX2GZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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