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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129b653bc1e7ef3747e0c68caeaa16ae63e34969ceaf3e291ec270a3887cf730' 
  AND token = 'QuBnlpVTUSeBC3ZAk8jBZUiyHmnsNC0UKRhiWRQPw0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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