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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa72a9645d64b3afa5687c1b73a0b2f669bc84b18e45a7fd822818534ea4e46d' 
  AND token = 'ZrCQSWpZewIzchbb5arM/7TiI57Z89+XjDhNFFWhIms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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