SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0737b96a98e6f540d1072137ba85440c5085e23e8f6fe207c0b8e1e0dfbef1f' 
  AND token = 'BCj7T+8SqCW1/jehDbLVyXKvagpjnf/69ewR/8kDlJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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