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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fed01887ddf42b81534602a0c73bfda6269eb7707f4395e21a0361be0d09b6d' 
  AND token = 'gca00N43Reggk2kB8T3gLlx38WxnnINPZEfVQfpGh7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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