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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81748e84964226d5a3e87875088fc11e01f60bed6b47c6be3860a0702510d329' 
  AND token = 'kvs9tfrm4+lOqyqO91JuzG4ire8pWqxxxUXL6S598XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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