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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4602a7c598fda6cdc1014ec32ad28947c57f09ed02f4262159e24f4598f71768' 
  AND token = 'TWtVc7rxTzO7TniaujcZoWGZmlL/8/ZOv4FqNDaSCmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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