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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5350f6dba470447b0d6f053fb98650b23ee7cd073453113efd589fb20845e538' 
  AND token = 'yu9vWU5GnxIIOB7R/AHyurP3xT3OkCZ0wuBb0AR5P7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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