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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320627a95519135095937f1b9265f2e8bbf5ec05d2b7a23c757509e6b07e9795' 
  AND token = 'wfH2XkN+byL0N5AiG7Yk+gVXBxXKXG6+n85EbKVFqZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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