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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042e9ccb0fa1c6ad78e0494a03ccd748149470f3716b53780287b96d6ec09409' 
  AND token = 'J+/dtnRAToXuhU3BqdXg4b+NB43AJpevw6BNidUoD68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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