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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6638251f4b268ab861f7c0cef507d3420c8d5d92e5923dd6f4a222d40a0f9ed3' 
  AND token = 'tc5Z9jqmE6jTWEoa890sO4D9Vt9MTDyCUhswUuGXPOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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