SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d25dc18112ab05a3d51c2cf3a8ca2851f71e976ea69b2b2f065a2440c3e5198' 
  AND token = 'sRBnRtZi+Rse7w4Sq7UKjGhPBySIa+pm/gXQ2hRGGEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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