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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6915d3b6591034589dcc9192c30233805424e0e4934b07aa34f75e715a7c3ad0' 
  AND token = 'm67hZtvJK8UiYlJ42qi+h+IaJR0rA9OFJaBtTZv2728=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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