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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf4140204f68c12139707c4e2aaba6216f7644e904126da5f263d0f3371b768' 
  AND token = 'lE6QWinE9UesatCmzbN3eWqpdi0SE9oIcFdRU3TG2B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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