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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3813a8d6e94c5ff2913d7729eb043f993cad71dbaa3714ea350b5aec4fbf69d9' 
  AND token = '4U++EFZXWXViuHh+uxlpt3NAPv8i/7wGNXe3pUOrPuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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