SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b763cec3b405d57b5edd693af668e04504778506c8c58fb9c38d782df31b8f' 
  AND token = 'iHLwLBYJgg/lrWh42bU1kagAGODxUKNF/6RIQC+AXR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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