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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb0345974a4193a96295ace4fda65ef4437dc098b63639cdbbf6beb4b43dc13' 
  AND token = 'iUqD4XlELXh5lshgLGdNHjvDaDRaXsQe3xXBBLrv3qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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