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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4953e4f00ec72ef83c9337d6b09bdd446bd02a318baa66c53cfbda22f95f8df' 
  AND token = 'yiYlDb/Ra2ouMLTGr2bPpba1+RkV16x6wens/Ks88yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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