SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a9fb02514f0129863a228ccc66da49154f1813d33d4be9698e60d7f85f2fbc' 
  AND token = 'dJO+vYglitInUMZSATOEgDYMprqAhS0j7Iy6uXxk/cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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