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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35acc7d32c87f935829a464c3e7ac1725d0f74ebc2f08c541a7b48a68cb0bf88' 
  AND token = 's28se9ahjGMWb8guBhS0+oH5JCxQ4SquT4QJmGnWHJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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