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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4be70d748bd2c23d5dc274fe58bf3f46b560b03ceba79365398152bd37639d' 
  AND token = '3+bSLPrOl6unze1Wo9SYDZdBiUr90hT2bhJ32Lsfpn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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