SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7d7f328e31b470a7b145da26f892725890d546e706cd9cfc2c80fcb7f2355f' 
  AND token = '122/a13Y5vg0Pr3zsJGZlKHsP1V2DF+Rl6zVJ3RGmzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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