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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ba2deb6beb8bab0989ac29b36e34917d86a70114542facc6fe01b1eb9e3f45' 
  AND token = '2fOEtSr6LbSG89KNsdWW5Zo0Rk3Rbx1hR4XKRPNKTOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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