SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c07d01777e51391fac9669bf00bb571dfd139e7ddc2b82bc3f8d4eb4fb4759' 
  AND token = 'jWuLqvtElFhAe2iG3w2XjAFj9YtLwmkRGAzzh1o1ZKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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