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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd78e18ee6ec05e6583e982ab81fbf48d28c7c8875173bff08212f5c3797129c' 
  AND token = '8hJN7WlmIdR4yfvhdGbsBSctoEgtpGVxB+7YNbzLkd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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