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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836adc17c531f300bf6ce5e55baa9c65f9571098c72d7b4c1457f057bfb3adda' 
  AND token = 'ce+pn9Fyw9ccuLJGn+JoJDvszS9vncbxc5D9mX5EMJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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