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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d92e764ca4d7af02e04bf8c31d8ac042e75665255f7078b0df7d70127b2f417' 
  AND token = '0jSsFJ4aTOixA/fBUsuQs2R1s99UIl9AhZ35cgYEdBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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