Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3367df8dc01d6e2e6f103643378cc536785d57414ccd110827126d298677b6a' 
  AND token = 'L8jw/6ZaUMUbwrRrgGRiI8NvCb+bkOB45RAPLP4LgOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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