SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02023d4bb6dbd64f8565f7c8e773bd7f93b7ef1fada327bd91c4d65659d218c1' 
  AND token = 'FEfDBYP/H3uc+JOISlm4eEFXyP38l/XzT3tuGuDzviw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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