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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4408070363e7d7c8efe64b9bc6bf12a18052cf6bb698eca8ac7b1cb14c72100' 
  AND token = 'lnPCIWSF5jL7M3AfhtOzW4W5CjOnKyFW5K8VLWGgoI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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