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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f42886c2bdd685f1829a4fccc07b180865ee52a3f7ffee2886324aa0ba4fbeb' 
  AND token = 'bqoLcqahnuCb6obtxZa6JPRVjc9KPznV7J6zfC4PzaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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