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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a56f90733491aa9f413c156e6615bff462b798ea4592599ab48ce657d4913f5' 
  AND token = 'CqDpUopt+q/yQRnChaM7PCSheOLvhPQNJGzo1NM8S80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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