SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b599069463329a0a637cd4bd1580150180cf7b2c83f651dd54488b8c34e2449a' 
  AND token = 'BwgCtJKjDQ5VZN51Vhy2TF9REJZnYQb6XY0tSUIYBNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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