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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672cc69b7ef7a204893b1df5c59de5b6a43d7bf4e6effecc75fd7c9181ccf6d2' 
  AND token = '7wX9lygF3dZ8fNbdII+9bWu3huYldmfRSjcKNYrSZq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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