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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95298b8363cc0b3bfb003d03fc8be954d0fd31f507872154d084be4c3db7b494' 
  AND token = 'A/XzmizUGU7xfAG6fdqzY6JicP69BkToaW5PmTGH6So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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