SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97525db8903729e1bc4b1b6cb29b8fde03000c65f31abf1c4852738557d8bc62' 
  AND token = 'gz2vR1C/DcQA+MNKeqa9TZkq1VSJ9hSo6rauhJzR+8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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