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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fa18e347df7cdf20b15e11ebea4b581f68b68ef7f3fd7ecdf71fc55aaed4b7' 
  AND token = 'gs2tc0yLJ3t8TCgfqFQ0d0cUiCCtrLhTrytnLVXgCQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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