SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d32cffa924bca347b3c6987d059d1bf50e7a3c3595c81a9805773720f8858ef' 
  AND token = 'DU5uzDNPRAPB8jmI74vZazsXkox7Qj5VgwyQYBHsKOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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