SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82336b52854c67b19edfb9c5f09c22a60c6f5b8930b30fcaa9f098b96147695d' 
  AND token = 'iNl9jLiciSvJjnZp8JZlc359KpPHg/+1hG4Mkgmr3eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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