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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6720c71499c35140e3fbe4371ef3d2e0ad98bee390bc8094a0958a4e2eeef7' 
  AND token = 'NI4mSJYdDqE5Tqza7zoCkTowDXHh4yda+khZ4JeGG7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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