SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8187cb9e708ff96156d1832fc31b3dcb47fbdca27a5fa45233db93116e3dba1' 
  AND token = 'zQZdlJIp6ts/mFBDYFbHfE/uvlf56LKi8uY+tRGqDqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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