SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bcb5e6f3b4c28bc0bad49da51ca98bc8ef20b4c22a4ef37f369a306933245c' 
  AND token = 'xRTz5IYVsf9jtamCrq7oKUwyXOh+OQibIYOAhJV5WPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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