SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d1096fdb9c5bb083b0da76530cc19f97185157bd61b5d9459b7cf7024f15bd' 
  AND token = '7i/yhI6gu5GPfR2tMC2HSjdpGguZ++ZvlpeGJ5MYlsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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