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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa56cc520b047b6574f2b700b420989158ca3086288e76e79298a24019f383f' 
  AND token = '5yy6BT9OEJcDdIJO7TwvG33TIP/grSrUBoA1WXuAv3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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