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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3604e212c9a31a413bfe899ade67e424507e2845ed0946b855595d71eac06130' 
  AND token = 'taoq2jcmmof0cd71Z26bl7uyCbGzOXEfnk2JSrQHpfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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