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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ff1b31cc2441f6afcdec2404e3041f23540e4b947bb3289b7057c5f946290b' 
  AND token = 'P+CM8S1A4QhNcw/udJaDnp0J646988mOXDJK+OlUmyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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