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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe86473ecf52fa4e94b737a90ede4d6deeb437c14be9d889bcba9d20b9b50e12' 
  AND token = 'xmGfY4WIyN0712lrv3mjx+wulFA/kXR2LTUBB3LQsHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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