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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adae8a1163d8fae67c469124b9c7f64ebbfb7eedc54ebfec98c501446d146276' 
  AND token = 'yMy573bmSh9Znz9o8KItnIQk+acugNAQtPlWS9CjnsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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