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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9c7c3dd6013f897456171628a19bc97b47c4526152171303387771f9afea5b' 
  AND token = 'ELShIxwwARuqFBgTkgzFal07b3O5EE7o28LUaMApxVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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