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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89603b041a8a9e7250a17a5a5ac2a9526e05c821a2f62a1b832020d5dd7a9d68' 
  AND token = 'JOfP3XqIxq0cnJL73hVxdUjvokYInkc1nZV8OK9VeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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