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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dcf5934a26927a48701bbee6520b8a61b7798aeaf53b41b7355e5d58f5e364' 
  AND token = 'pM0ltst0e4hZYLLlJb7qsl5D6W9gMxbimYl6lodWByQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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