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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00700b6cdcb466f7ed1c612d777d1a1b8c5f92fafbe9e3a7c15c8a4068cbbbbc' 
  AND token = '4yaquSGzW/yn56d/WEp4WeKG9ispqcbiv+n5u6U9cFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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