SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b826ae43ab28016f59b455703f0465ebfa4766d2fbb9a1f50573c6cf7cd0d22' 
  AND token = 'bbIDQI7UPwWDnglfj9JYColZv2NRGHr3+cwF0PJKIS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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