SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32039d562e1e88b030fb8b822e22baf909dc4e58a686a84b472694b8c72a5881' 
  AND token = 'QS4tLslJKbcoV+l+kRTXNQMn5K0fEZcGtK/+ZEJ47w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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