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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ccdc3848d79dfc90af7807d9477aa701fb890c8f93b4ce6d4c1bcf5f6a4458' 
  AND token = 'WbyD5vXLo5Izj0cAGK+dA1oF6bt/r91b2VYMEZXaRaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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