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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da98c313f96fb846df2a451c86651dae8caba72fd1d0598a07cc387261ee7ff5' 
  AND token = 'aWnmhPogSYxgZiSSrz06L9Dl0bUBcLkgf0hk9mb5RBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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