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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096f8732142f84554d3fe13eb87ab4e3e49843f92250e2e8b99dfced13efa7b7' 
  AND token = '3/0Tt+6wQvt3sVYWDIn7k8aaA6cqC0cckRTg61Ztdog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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