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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d69b8514b84681be8247e41d04ca94bb69fe6795f25d7b1b038a901d6e6471' 
  AND token = 'NotIuUlDXBDx4W8eHMmTw7x9qekdBVAJS5WvMNc0yoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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