SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9711c3fd8520ac3a2721b43da461b4ad1539555db783b29f2aa0d9eae75e5943' 
  AND token = 'UvwK6QYpPgQuLJ2rizddv8Jv8ra+/cZ9HmP/Th8BD3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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