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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6839b28a913e17f800a8a9d9c10beb92d78efdfc7b814ead2ee95eccada56288' 
  AND token = 'que2gvDMloja9sgnPnzm6BZaL6Eol8GG80vDBBaCUmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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