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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bced8bf99242d5f4bb54368c427a89ba6316e1edcbad85e62d3af68962fbe3f' 
  AND token = 'PHN5RAihwQmVpyIJcV8XoapHjhZjDMQAhcV6pRrUhdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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