Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a1bc8434f22ab665989ee82ae5c4a8936808e2c291100685828d61f9449ac2' 
  AND token = 'HySAlJSerVMYQkvgugf7lD8CTMEadkCuV4T7cPPXlak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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