SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b60cac699035f39b0a4869f3e2161893bf752688d83994e61e9282e2e67e9f' 
  AND token = 'CotqWDRBvChOw/gYxdyzen/fho72CCdtcIj5+FpQSXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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