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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cabd5fa38958abd5042ed8a65e1488f39939466a5423f1198fdebd35e9586f' 
  AND token = 'YisKCRimQa/XxS8l7Q5+/rCyc10w4+1mFq017t5jqpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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