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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6022842f27e24f9ad75733f126fc2f9546dd3cdbc0b39abb803e0eb1178b49e' 
  AND token = 'lFP0mzZ1X2y5zQIpo4gj2xgAdSvlUIi7yNfmw5DkAq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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