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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f9306e9011cc85e48a6fb24818c8fd9b528916871176691e617719f267511d' 
  AND token = '47Wr33w4FCDrq9MIo+HqBOL51iEvaWzkszEBGO34p3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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