Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3444da58e9be53bdee3d5cab0798b957564ced523eb71ca85ee24355e6a4dcb' 
  AND token = 'HhB1V3zF5/EW3niIMmiE+1UXFmz/HxPLsjy2AfAvYBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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