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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c606f50c4850a36547593cbec165d544c2fe74ea5896e8147157ed7ccd13ce' 
  AND token = 'nCP6e15arwjF5KDyr9TAAuoJ8EqJMw7UUKVzIWVfwQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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