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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700a219aefcbec1d569acfd9fc8a02e681e118e5165140d82c060985e86cdba0' 
  AND token = '4duVgxKzBlBmkd9oiIQ3DZCXfG8SVe+7vf/jAKvXgI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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